Ben Affleck is said to be "heartbroken" as his ex-wife Jennifer Garner prepares to marry her longtime partner , John Miller, RadarOnline.com can reveal.

The 53-year-old actor, who only finalized his divorce from Jennifer Lopez earlier this year, is reportedly struggling to accept that Garner, also 53, has moved on for good with the man she now calls her soulmate. Article continues below advertisement

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The pair were married for 10 years after meeting on the set of Pearl Harbor in 2000, and share three children – Violet, 19, Seraphina, 16, and Samuel, 13.

Despite their divorce in 2015 , Affleck and Garner have

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